Yellow Warbler
Setophaga petechia

f4.5 @ 1/600s, ISO:2000, Nikon D3S w 500mm

"American Yellow Warbler," Wikipedia, the free encyclopedia. As usual for members of the Parulidae, yellow warblers nest in trees, building a small but very sturdy cup nest. Females and males rear the young about equally, but emphasize different tasks: females are more involved with building and maintaining the nest, and incubating and brooding the offspring. Males are more involved in guarding the nest site and procuring food, bringing it to the nest and passing it to the waiting mother, which does most of the actual feeding. As the young approach fledging, the male's workload becomes proportionally higher.
Magee Marsh. Oregon, Ohio